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Service bulletin TIB-43-23

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10042784
Published by NHTSA2012-01-11
Manufacturer's numberTIB-43-23
Manufacturer's date2011-11-08
NHTSA componentENGINE AND ENGINE COOLING:EXHAUST SYSTEM

NHTSA's summary

KENWORTH: INFORMATION REGARDING REAR NOX SENSOR REPAIRS SHOULD INCLUDE SYSTEM UPDATES FOR CHASSIS OPERATING IN CONDITIONS WHICH RESULT IN MOISTURE RELATED SENSOR FAILURES WITH IMPROVED MOISTURE PROTECTION EXHAUST DESIGN FOR REAR NOX SENSOR. *PE

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Engine, Exhaust and emissions

Vehicles listed
KENWORTH C5002009 to 2011
KENWORTH T6602009 to 2011
KENWORTH T8002009 to 2011
KENWORTH W9002009 to 2011
KENWORTH W900S2010

Listing a model year does not mean every vehicle of it is concerned: the document says which.